What Stemar Electrical Products does

Stemar Electrical Products PTY LTD is an Australian specialty manufacturer founded in 1969 and headquartered in Revesby, South Western Sydney, producing custom-engineered instrument transformers and low-voltage distribution equipment for the electricity supply industry. Its core product range centres on current transformers (up to 36kV, primary currents to 20,000A), voltage transformers, control transformers (40VA to 300kVA), cast resin and distribution transformers, plus LV switchgear, underground distribution pillars, service boxes, and copper busbar assemblies. Manufacturing is supported by 15 toroidal and 4 linear winding machines, vacuum epoxy casting, and a NATA-accredited laboratory (Accreditation No. 14769, ISO/IEC 17025-2018). The product portfolio also includes the Combined Transformer Transducer (CTT), which integrates a CT with a 4-20mA loop-powered electronic output.

The company operates a B2B, project-driven sales model targeting Australian and Asia-Pacific utilities, power generators, and switchgear OEMs such as Snowy Hydro, Hydro Tasmania, Energy Australia, Energex, Schneider Electric NZ, Siemens Australia, and Startco. Pricing is fully quote-based — products are custom-engineered to customer-specified standards (Australian AS, IEC, ANSI), ratios, classes, burdens, and dimensions, with test certificates supplied. There is no published standard pricing; customers engage a dedicated sales team for specifications and quotes. The company is privately held and family-managed (Maraldo family, with over 100 years of combined staff experience), has held ISO 9001 quality certification since 1989, and is registered as a supplier with Asian utilities through the Asia Pacific Utilities Group (Achilles platform). Revenue, headcount, and financial performance are not publicly disclosed.

Name

Stemar Electrical Products

Legal name

Stemar Electrical Products PTY LTD

Website

https://stemar.com.au

Company type

Private

Founded year

1969

Operating status

Operating

Headcount range

11–50 employees

Short description

Stemar Electrical Products is a privately held Australian manufacturer, founded 1969, specializing in custom-engineered instrument transformers (current, voltage, control, cast resin) and low-voltage distribution equipment for utilities, power generators, and switchgear OEMs across Australia and the Asia-Pacific region.

Ownership category

akta.pro rank

Product category

Electrical Equipment Manufacturing

NAICS

Power, Distribution, and Specialty Transformer Manufacturing (335311), Switchgear and Switchboard Apparatus Manufacturing (335313)

SIC

Power, Distribution & Specialty Transformers (3612), Switchgear & Switchboard Apparatus (3613)

akta.pro primary industry

Transformers (Power, Distribution, Instrument, Specialty) (IMAGAAAA)

akta.pro secondary industries

Switchgear & Switchboards (HV/MV/LV, GIS/AIS) (IMAGAAAB), Industrial Control Cabinets & Power Distribution (Panels, Switchgear for Automation) (IMAHAHAK), Low-Voltage Switchboards & Panelboards (LV distribution panels, MCCs, switchboards) (IMAGAEAA)

Keywords

• Instrument transformers
• Current transformers
• Voltage transformers
• Distribution equipment
• Switchgear manufacturing

Headquarters

HQ city

Revesby

HQ country

Australia

HQ region

Oceania

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Personnel, Supply Chain, Operations, Technology or R&D, Infrastructure, Marketing or Sales

Revenue model

1. Transformer Sales: Sale of manufactured instrument transformers (current transformers, voltage transformers, control transformers, distribution transformers) and cast resin variants. Products are custom-engineered to customer specifications with test certificates.
2. Distribution Equipment Sales: Supply of low voltage distribution equipment, underground distribution components, switchgear, CFS units, distribution pillars, street lighting panels, service boxes, and special copper busbar work.
3. Engineering Services: Custom engineering solutions including neutral earthing cubicles, circuit breaker fitouts, star point generator panels, phase bars with integral CTs, consulting services for fault calculations and CT design requirements, and electrical fitouts.
4. Testing Services: NATA-accredited laboratory testing services for current transformers and transformers, including portable CT testing for on-site testing of circuit breakers and switchgear.

Pricing tiers

Go-to-market motion1 record

Distribution channels2 records

Marketing channels2 records

Core offering

Stemar Electrical Products manufactures and supplies instrument transformers (current transformers up to 36kV/20000A, voltage transformers, control transformers from 40VA to 300kVA, cast resin and distribution transformers) and low-voltage distribution equipment (LV switchgear, underground distribution components, switchboards, copper busbar work). The company also provides custom engineering services including neutral earthing cubicles, star point panels, circuit breaker fitouts, and NATA-accredited laboratory testing for utility, power generation, and OEM customers in Australia and the Asia-Pacific region.

Product overview

Stemar Electrical Products is an Australian manufacturer founded in 1969 specializing in instrument transformers and distribution equipment. Their core product portfolio centers on Current Transformers (including Block Type, Cast Resin, Outdoor, Plastic Shell Encapsulated, Split Core, and Tape Finished variants), Voltage Transformers, Control Transformers, and Distribution Transformers. They complement these with Distribution Equipment including LV Switchgear and Underground Distribution Components. Their CTT (Combined Transformer Transducer) range offers integrated current transformers with 4-20mA output for industrial monitoring. Engineering Services including Customer Specials, Consulting Services, and Electrical Fitouts provide custom solutions for specific requirements. The company operates manufacturing facilities in South Western Sydney with NATA accredited testing laboratories.

Differentiator

Problem solved

Functional benefit

Products and services

• Current Transformers

Quantifiable outcome

• Minimum 95% customer satisfaction target

Named customers7 records

Segments3 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Partnerships

One partnership is on record.

• Asia Pacific Utilities GroupminorOthersStemar is a registered supplier with most Asian utilities through the Asia Pacific Utilities Group (operating via Achilles platform). This registration enables Stemar to supply products to utilities across the Asia-Pacific region.

Scale indicators5 records

Recent moves5 records

Direct peers

• Arteche: Specialty manufacturer of instrument transformers (CTs, VTs), protection relays, and substation automation — the closest like-for-like peer to Stemar in product scope and target customer (utilities), though operating globally with much larger scale.
• Kuhlman Electric (Schweitzer Engineering Laboratories): Specializes in instrument transformers for protection applications, owned by SEL — competes with Stemar in protection-class CTs and integrates with protection relay systems sold to the same utility customer base.
• Trench Group (Siemens Energy): Specialist in instrument transformers (CTs and VTs) for HV transmission and distribution, now part of Siemens Energy — directly comparable product portfolio to Stemar's CT and VT lines serving utility customers.
• Ritz Instrument Transformers: German-based specialty manufacturer of instrument transformers and cast resin variants serving utilities and OEMs — directly comparable to Stemar in product mix, custom engineering orientation, and quality standards focus.

Broad incumbents

• Schneider Electric: Major OEM of switchgear and electrical distribution equipment that integrates instrument transformers; Stemar supplies starpoint panels with built-in CTs to Schneider Electric NZ, making it both a peer and a customer relationship.
• Siemens Energy: Manufactures instrument transformers, switchgear, and turnkey substation solutions globally; Stemar has done circuit breaker fitout work for Siemens Australia, evidencing direct interface in the same product category.
• ABB: Global incumbent with a broad instrument transformer and switchgear portfolio (including ABB Ability digital CTs/VTs) serving utilities worldwide — directly comparable to Stemar's transformer business but at vastly greater scale and with R&D-funded product roadmaps.
• Eaton: Diversified power management manufacturer offering LV switchgear, distribution equipment, and components for industrial and utility customers — overlaps with Stemar's LV switchgear and underground distribution pillar product lines.
• GE Grid Solutions: Supplies instrument transformers, switchgear, and grid automation as part of a broad grid solutions portfolio; competes with Stemar in utility tenders for CTs/VTs and adjacent protection equipment.

Emerging players

• Polestar Instruments: Manufacturer of instrument transformers (CTs, VTs) and protection equipment serving utility and industrial customers, primarily across South Asia and the Middle East — comparable in product scope and custom-engineered approach to Stemar though operating in a different regional market.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat5 records

Key risks6 records

Key highlights6 records

Customer concentration

• LinkedInlinkedin.com/company/stemar-electrical-products-pty-ltd

Compliance4 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles5 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Stemar Electrical Products